Lest you think me hopelessly Christian in my appreciation of sacred spaces in SL, or RL, here is a location that I found quite moving. Especially given I lean toward Buddhist beliefs in many ways.
The snapshots here show me (in a new outfit from *slave* and shoes from Grumble) exploring the site in SL called Yogyakarta Borobudur.
These locations are based on real world sites that are truly ancient and awe inspiring. You should stop by and see if you can't find a bit of inner peace.